B a _{0. 6} S r _{0. 4} Co _{0. 9} N b _{0. 1} O _3 --δ (BSCN) perovskitetype oxide was prepared by the solid state reaction. The high temperature chemical compatibility between BSCN0.6 and G d _{0. 1} C e _{0. 9} O _{1. 9 -5}(GDC) were analyzed by XRD. XRD patterns indicate that a week solid solution between BSCN0.6 and GDC takes place after the BSCN0.6GDC composite material was calcined at high temperature. However, this solid solution does not show a negative effect on the performance of the cathode. The mixture of BSCN0.6 and GDC in a weight ratio of 70∶30 was used as SOFC composite cathode and the electrical property, thermal expansion behavior and electrochemical performance were investigated. The electrical conductivity was found to decrease with increasing GDC content|however, the thermal expansion coefficients (TEC) of BSCN0.630%GDC composite cathode decreased, which enhances the thermal match between the cathode and GDC electrolyte. With BSCN0.630%GDC as the electrode, the polarization resistance of a symmetrical cell BSCN0.630%GDC//GDC is only 0.047～0.012 Ω•cm2 in 700～800 ℃. Therefore, BSCN0.630%GDC composite material is a promising ITSOFC cathode.